The question is...
Do you really need Serum? 'Cause I can tell you right now, it's sounds pretty swell without it.
I'll agree with neB that the drums could use toning down. They are hella compressed and aren't breathing like they should - very much on the muddy side of things as well. Also agree that you've got the highs nailed, but the mids are lacking and the sub could be even warmer than it currently is.
Love the melody. The synth is great; just a little more thickness is all it needs. Otherwise, for a WIP, impressive. I eagerly await the finished product!
Cheers!
-J.P.